Quick tuft test with “nose job” bumper and the original coroplast undertray I made. Looks very good, I didn’t see any issues although my camera is rough. With this setup at 100 km/h, my water temp was holding at a consistent 86 degrees Celsius.
I did a test on the same route in the same weather, after removing the undertray. This brought water temperatures up to a consistent 88 degrees Celsius.
I pulled over quickly and stuffed my sweater in the radiator duct. Back on the road at 100 km/h, the water temp began to slowly rise, and then it peaked at 103 Celsius before the fans kicked in. I pulled over and removed the sweater. The fans were able to pull air in and lower the water temp.
The ductwork seems to be functional, using the testing I have available. It is currently -3 to -5 Celsius outside. I noticed only one mystery in testing, and that was my intake air temp rising quite a bit. I wonder if the intake box is designed to pull exhaust air from the grille.
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The car is on the lift now, as I’m doing maintenance/checking before another big trip. I took some brake drum plugs off my parts car and realized that it has some underbody paneling. Sweet! That should be plug and play.
(Upside down, whoops)
For comparison, here’s the rear underbody of my car:
Improvable? I’d say so.